Dry Electrodes with an Active Guard to Improve Bioimpedance Measurement Accuracy
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Author
Chabrowski, Léa
Chételat, Olivier
Moreira De Sousa, Antonio
Rosenthal, James
DOI
Abstract
Measurements of body tissue impedance can be adversely affected by the skin/electrode impedance, whose value can vary significantly with movement or natural properties of the skin (e.g., dryness, sweat). Bioimpedance measurements can be improved with a tetrapolar configuration, which uses pairs of separate electrodes for current injection and voltage measurement. Based on a simple skin/electrode impedance model, this method succeeds in measuring the internal bioimpedance without being affected by the skin/electrode impedance, however, inaccuracies are observed when applied to more complex, real-world bioimpedance measurement models. To overcome these challenges, we present an electronic innovation using actively guarded dry electrodes that improve bioimpedance measurement accuracy in this more detailed model.
Publication Reference
CSEM Scientific and Technical Report 2024, p. 97
Year
2024